Re: Idea for IR zoning with HV

["andy_powell_is" <ukha@xxxxxxx>]

Great, thanks Ian


--- In ukha_d@y..., "Ian B" <Ian@M...> wrote:
> I'll help you through this one Andy if you like. I am away from 
mail for the
> first three days of the week but back late on Wednesday. We can 
pick it up
> from then onwards if you like.
> 
> Ian B
> 
> > -----Original Message-----
> > From: andy_powell_is [mailto:ukha@b...]
> > Sent: 28 April 2002 13:15
> > To: ukha_d@xxxxxxx
> > Subject: [ukha_d] Re: Idea for IR zoning with HV
> >
> >
> >
> > I really really wish I understood this... it seems like a
simple
> > solution that will work... but I just don;t understand it :(
> >
> > Anyone fancy building something like this for me ... pretty 
please?
> > with idiot proof docs.. :D
> >
> > Andy
> >
> > --- In ukha_d@y..., "Keith Doxey"
<lists.diyha@b...> wrote:
> > > You dont actually need ANYTHING to Zone IR on
Homevision.
> > >
> > > The 3.5mm jack has the tip connected to SWITCHED +5v which
is 
the
> > modulated
> > > IR output.
> > > The sleeve of the jack is permanently connected to
ground.
> > >
> > > PORT A is an open collector driver which GROUNDS the pins of
port A.
> > >
> > > If you wire like this you have IR
> > >
> > >
> > > 3.5mm
> > > Tip
------------------------------------------------------------
----
> > --------
> > > ----------------------
> >
>                      
                   
                     
> > >
                    
> >
>                     
R                  
R                    
R
> > >
R                  
R
> >
>                      
                   
                     
> > >
                    
> >
>                     
E                  
E                   
E
> > >
E                  
E
> >
>                      
                   
                     
> > >
                    
> >
>                     
A1               
A2                   
A3
> > >
A4                 
A5 ETC
> > >
> > > where R is a series resistor of about 100 ohms, E is the
IR
> > emitter, A(x) is
> > > the port A pin
> > >
> > > Before you send an IR command you just set the required pin
of 
port
> > A to low
> > > (remember the logic is inverted for PortA) and away you
go.
> > > Keith
> > >
> > > www.diyha.co.uk
> > > www.kat5.tv
> >
> >
> >
> >
> > For more information: http://www.automatedhome.co.uk
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> >
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> >
> >
> >
> >



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